<template>
  <transition name="slide">
    <div class="user-center">
      <div class="back" @click.stop="back">
        <i class="icon-back"></i>
      </div>
      <div class="switches-wrapper">
          <Switches :switches="switches" :currentIndex="currentIndex" @selectSwitch="selSwitch"></Switches>
      </div>
      <div ref="platBtn" class="play-btn" @click="random">
        <i class="icon-play"></i>
        <span class="text">随机播放全部</span>
      </div>
      <div class="list-wrapper" ref="listWrapper">

        <Scroll ref="favoriteList"  class="list-scroll" v-if="currentIndex===0" :data="favoriteList">
          <div class="list-inner">
            <SongList :songs="favoriteList" @select="selectSong"></SongList>
          </div>
        </Scroll>

        <Scroll ref="songList" class="list-scroll" v-if="currentIndex===1" :data="playHistory">
            <div class="list-inner">
              <SongList :songs="playHistory" @select="selectSong"></SongList>
            </div>
          </Scroll>
      </div>
      <div class="no-result-wrapper" v-show="noResult">
        <NoResult :title="noResultDesc"></NoResult>
      </div>
    </div>
  </transition>
</template>

<script type="text/ecmascript-6">
  import Switches from '../../base/switches/switches'
  import Scroll from '../../base/scroll/scroll'
  import {mapGetters,mapActions} from 'vuex'
  import SongList from '../../base/song-list/song-list'
  import Song from '../../api/song'
  import{playlistMixin} from '../../common/js/mixin'
  import NoResult from '../../base/no-result/no-result'
  export default {
    mixins:[playlistMixin],
    components:{
      Switches,
      Scroll,
      SongList,
      NoResult
    },
    computed:{
      noResult(){
        if(this.currentIndex===0){
          return !this.favoriteList.length
        }else{
          return !this.playHistory.length
        }
      },
      noResultDesc(){
        if(this.currentIndex===0){
          return "暂无收藏歌曲"
        }else{
          return '你还没有听过歌曲'
        }
      },
      ...mapGetters([
        'playHistory',
        'favoriteList'
      ])
    },
    data(){
      return {
        switches:[
          {name:'我喜欢的'},
          {name:'最近听的'}
        ],
        currentIndex:0,
      }
    },

    methods:{
      back(){
        this.$router.back()
      },
      selSwitch(index){
        this.currentIndex=index;
      },
      selectSong(song,index){
          //这个song是从缓存取出来的，是一个对象不是song实例
          this.insertSong(new Song(song))
      },
      random(){
        let list =this.currentIndex ===0?this.favoriteList:this.playHistory
        if(list.length===0){
          return;
        }
        list = list.map((song)=>{
          return new Song(song)
        })
        this.randomPlay(
          {songs:list}
        )
      },
      handlePlaylist(platlist){
        const bottom  = platlist.length>0?'60px':''
        this.$refs.listWrapper.style.bottom= bottom;
        this.$refs.favoriteList &&  this.$refs.favoriteList.refresh();
        this.$refs.songList &&  this.$refs.songList.refresh();
      },
      ...mapActions([
        'insertSong',
        'randomPlay'
      ])
    }
  }
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "~common/stylus/variable"

  .user-center
    position: fixed
    top: 0
    bottom: 0
    z-index: 100
    width: 100%
    background: $color-background
    &.slide-enter-active, &.slide-leave-active
      transition: all 0.3s
    &.slide-enter, &.slide-leave-to
      transform: translate3d(100%, 0, 0)
    .back
      position absolute
      top: 0
      left: 6px
      z-index: 50
      .icon-back
        display: block
        padding: 10px
        font-size: $font-size-large-x
        color: $color-theme
    .switches-wrapper
      margin: 10px 0 30px 0
    .play-btn
      box-sizing: border-box
      width: 135px
      padding: 7px 0
      margin: 0 auto
      text-align: center
      border: 1px solid  $color-text-l
      color: $color-text-l
      border-radius: 100px
      font-size: 0
      .icon-play
        display: inline-block
        vertical-align: middle
        margin-right: 6px
        font-size: $font-size-medium-x
      .text
        display: inline-block
        vertical-align: middle
        font-size: $font-size-small
    .list-wrapper
      position: absolute
      top: 110px
      bottom: 0
      width: 100%
      .list-scroll
        height: 100%
        overflow: hidden
        .list-inner
          padding: 20px 30px
    .no-result-wrapper
      position: absolute
      width: 100%
      top: 50%
      transform: translateY(-50%)
</style>
